Secondary mouthpiece for telephone-transmitters.



- x v S. S. WILLIAMSON.

SECONDARY MOUTHPIEGE FOR. TELEPHONE TRANSMITTERS.

APPLIOATIOKIILED FEB. 19, 1912.

' 1,041,545, Patented 001;. 15, 1912 I 'To all whom it may concern s-hmunr. s.WILLIAMson, F PHILADELPHIA, PENNSYLVANIA.

SECONDARY moU'rHPIEoE FOR, TELEPHoNE-TRANSMITTERS.

I Specification of Iletter s Patent. Applioationaiflled.February-19, 1912. Serial No. 678, 43.

Patented'Oct. 15,1912.

Be it known that I, SAMUEL S. WiLLIAM son, a citizen of the United States, residing at Philadelphia, in the county of Philadel phia and State of Pennsylvania, have invented new and useful Improvements in Secondary Mouthpieces for TelephoneeeTransmitters, of which the following is a specification.

My invention relates to a new and useful improvement in secondary mouth pieces for telephone transmitters, and has for its object. to provide an exceedingly simple and .eflective device of this descriptiomwhich niay be readily placed over the ordinary mouth piece of the transmitter entirely inclosing said ordinary mouth piece. and partially inclosing the head of the instrument.

the facility I When thusplaced, my secondary. mouth piece may be used. to so mufile the voice as to prevent the hearing of the conversation by anyone in close proximity to-the speaker.

Aiurther object of my invention is to concentrate the sound waves from the voice of the" speaker so as to intensify the action on the diaphragm transmitter thus increasing with which a conversation may be carried on over the telephone.

With these ends in view, this invention consists in the details of construction and combination of elements hereinafter ,set forth and then specifically designated by the claims. 5

In order that those skilled in the art to which this invention appertains may understand the same, I will describe its construc tion in detail, referring by numeral to the e ying drawing forming a part of ion, in whicha longitudinal section of my condary mouth piece, showing it o verthe ordinary mouth piece, and surrounding the head of the transmitter. Fig.2, a front view'of the mouth piece, and Fig. 3, an elevation of the secondary mouth piece, taken at right angles to Fig. 1.

In carrying out my invention as here embodied I form what I prefer to call a mufiler of a single piece of glass or other suitable material, consisting of the body 1, adapted to surround the ordinary mouth piece 2 of a telephone transmitter, and this body I prefor to extend so thatitwill partly inclose the transmitter head 3, as clearly shown in Fig. 1. v

4 represents a ring or band ofcompressible or elastic material, such as cork, rubber or the like, set inside of the body and prevented from withdrawal bythe annular shoulder 5. A clearance or space 6, is formed around the compressible ring so as to give it greater elasticity or range of action. The function of this compressible ring is to hold the device in place upon the instruinent and divide the interior of the body into'two compartments when the device is m use.

In applying the device to the telephone transmitter, the body is placed over the ordinary mouth piece until the outer edges of said mouth piece come in contact with the inner walls' of the compressible or elastic ring, when by forcing the device home, the.

compressibility and elasticityof the ring will exert su cient pressure upon the ordinary mouth piece 2, to hold the device in the proper position as clearly shown in Fig. 1. This also makes a division between the inner and outer compartment in the body of the device cutting ofi the communication ofair between the two except through the small groove 7 formed in the compressible ring.

8 is the funnel shaped extension which projects inward from-the outer edges of the secondary mouth piece to a considerable distance within the body so as to pass within the ordinary mouth piece 2 as clearly. shown and the secondary mouth piece is so formed at its outer edge 9, as to surround the lips of the speaker and thus house in the conversation. By this construction it will beseen that the sound waves passing from the speakers mouth will be muiiled from the surrounding air by the walls of the ordinary mouth piece 2, and the outer walls of the body of the device and also that the vibrations'which are set up in the face poi t-ion of the'head 3 of the instrument are housed in the rear compartment of the body thus modifying their action upon the surrounding air and as the sound waves from the mouth of the speaker must pass down the extension 8, around the inner edges thereof and downward to the inner compartment and then escape through the groove 7 to the outer compartment before finally reaching the atmosphere and it will be obvious that the voice will not be audible to persons in the vicinity of the telephone when. a conversation is being carried on.

In practice, I prefer to make my device of a single piece of glass, blown or pressed i, te shape, as glass has many advantages over most materials andis easily cleaned and kept sanitary, but-of course rubber, celluloid, papier-mach, metal or other material might be usedfor this purpose.

Of course I do not wish to be limited to the exact details of construction as here shown, as these may be varied within the limits of the appended claims Withoutdeparting from the spirit of my invention.

Having thus fully described my inventioL, What I claim as new and useful, is

1.. As a new article of manufacture, a secondary mouth piece for telephone transmitters made of a single piece of glass and having a body for surrounding the ordinary mouth piece and the headof the transmitter,

and an extension adapted to project into the ordinary mouth piece as specified.

2. A secondary mouth piece for telephone transmitters consisting of a body divided into two compartments by a compressible and elastic ring and a funnel shaped extension projecting into the body and adapted to pass into the ordinary mouth piece of the telephone instrument when the device is placed in position thereon as specified."

3. In a secondary inouth piecefor telephone transmittersthe combination of a body, a funnel shaped extension formed therewith and projecting within said body,

an annular shoulder formed on the interior of the body, a ring secured in place by said shoulder and an enlargement in the body forming a recess around the ring for giving the latter'limited movement as and for the purpose set forth.

4. As an article of manufacture, a'mufiler formed from a single piece of material provided with an inwardly projecting extension, open at both ends and a mouthpiece adapted to inclose the .head of the transmitter and the ordinary mouth piece while the extension projects into said ordinary mouth piece.

5. As an article of manufacture, a muiiler formed from a single piece of material provided with an inwardly projecting extension open at both ends, a mouth piece adapted to inclose the head of the transmitter and the ordinary mouth piece 'While the extension projects into said ordinary mouth piece I and means for holding the mufller upon the instrument.

6. As an article of manufacture, a mufiier formed from a single piece of material provided With an inwardly projecting extension open at both ends, a mouth piece adapted to inclose the head of the transmitter and the ordinary mouth piece while the extension projects into said ordinary mouth piece,

and means coacting with the body and the ordinary mouthpiece for holding .the mailer upon the instrument.

In testimony whereof, I have 'hereunto' afiix'ed my signature in the presence of two subscribing witnesses.

SAMUEL S. WILLIAMSON. 

